はい。新語です。 Let me explain details, because I found it is a good practice of my English. If my english is wrong, please correct it. It stands for リアルの世界が充実している男, which means a man who enjoys the real (i.e., not the virtual world in the internet) world because he has much money, a handsome face, a good physical ability, or a good job etc. People who are mainly living in the internet and are not enjoying the real world because of the lack of the above items jealously use this word. I don't think this word is used to describe a women. Also all definitions of リア充 are physical ones, such as money, face or social status. For example, a monk who is poor, living in a cave, dirty, and waring old clothes, but having a rich spiritual world in his brain, and enjoying that world is not called リア充.

大学でこの言葉が話題になったのは今年の9月です。 リアル+充実の造語でした。 今ではこの言葉を使う人はいないです。

"リア充" is informal word.